References of "Liquet, Dimitri"
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See detailSilica-based thin film solid-state electrolytes for Lithium-ion microbatteries
Hartmann, Korina ULiege; Calberg, Cédric ULiege; Liquet, Dimitri ULiege et al

Scientific conference (2018, June 19)

The emerging market of the Internet of Things, smart objects, wearables and others increases the demand for micro energy sources. Rechargeable lithium-ion batteries are a well-known technology for energy ... [more ▼]

The emerging market of the Internet of Things, smart objects, wearables and others increases the demand for micro energy sources. Rechargeable lithium-ion batteries are a well-known technology for energy storage. However, safety issues and high production costs constrain progress. Electrolyte solutions based on ionic liquids (ILs) with dissolved lithium salts can be confined into inorganic porous networks forming so-called ionogels, which are investigated as solid electrolytes [1]. Ionogels combine low hazard and good ionic conductivity. However, the growth of lithium dendrites may be observed during cycling, which reduce battery lifetime. In this project, we try to prepare a silica-ionogel to prevent dendritic growth by mechanical hindrance. The ionogel composition was studied to obtain a fast gelation and the correlation between the physical properties of the silica matrix and the electrochemical performances of the ionogel was evaluated. [less ▲]

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See detailSilica-based thin film solid-state electrolytes for Lithium-ion microbatteries
Hartmann, Korina ULiege; Calberg, Cédric ULiege; Liquet, Dimitri ULiege et al

Scientific conference (2017, September)

The emerging market of the Internet of Things, smart objects, wearables and others increase the demand for micro energy sources. Rechargeable lithium-ion batteries are a well-known technology for energy ... [more ▼]

The emerging market of the Internet of Things, smart objects, wearables and others increase the demand for micro energy sources. Rechargeable lithium-ion batteries are a well-known technology for energy storage. However, safety issues and high production costs constrain progress. Electrolyte solution based on ILs with dissolved lithium salt can be confined into inorganic porous networks forming so-called ionogels, which are investigated as solid electrolyte [1]. Ionogels combine low hazard and good ionic conductivity. However, the growth of lithium dendrites may be observed during cycling, which reduce battery lifetime. In this project, we try to prepare a silica-ionogel to prevent dendritic growth by mechanical hindrance. The ionogel composition and the influence of trifluoroacetic acid (TFA) as catalyst were studied to obtain a fast condensation of the silica precursor. [less ▲]

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Peer Reviewed
See detailUp-scaling of hydrophilic water-based coatings for easy-to-clean and anti-staining applications
Daniel, Alain; Wicky, David; Le Craz, Sébastien et al

Poster (2017)

Easy-to-clean surfaces can be obtained by the deposition of thin coatings presenting either superhydrophilic or superhydrophobic properties. A wide range of coatings and associated deposition technologies ... [more ▼]

Easy-to-clean surfaces can be obtained by the deposition of thin coatings presenting either superhydrophilic or superhydrophobic properties. A wide range of coatings and associated deposition technologies has been studied in the past years to elaborate such kind of coatings and promote surface cleaning by water. When considering industrial use, some important criteria must be taken into account including ease of processing and speed, coating robustness and durability, aesthetic, product toxicity and cost. This presentation deals with the elaboration at industrial scale of hydrophilic easy-to-clean and anti-staining layers on prepainted steel. This metallic material, used for building applications, is sensitive to environmental fouling occurring over the time and leading to inaesthetic dirtying of the surface. The solution studied in this work is based on a nanometric coating constituted of SiO2 which increases surface hydrophilicity and prevents from dust embedding in the paint. Thanks to the combination of these effects, the preservation of the initial surface aspect is highly improved over the time. Moreover, when an anatase TiO2 top layer is deposited on the SiO2 coating, an additional photocatalytic effect can be measured. Both SiO2 and TiO2 layers are deposited from aqueous colloidal solutions that fit with industrial requirements and tools. Their properties are described in term of easy-cleaning and anti-staining effects through water contact angle measurements, accelerated staining tests and natural outdoor exposure, on prototypes elaborated at industrial scale in a roll-to-roll process. The coating robustness and the durability of the properties are validated after accelerated ageing tests, including corrosion and UV resistances, and after mechanical deformation. [less ▲]

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See detailAqueous sol-gel synthesis and film deposition methods for the large-scale manufacture of coated steel with self-cleaning properties
Mahy, Julien ULiege; Léonard, Géraldine ULiege; Pirard, Sophie ULiege et al

in Journal of Sol-Gel Science and Technology (2017), 81(1), 27-35

A process has been developed to enable the large scale production of pure TiO2 films deposited on 316L stainless steel in order to get an easy-to-clean surface. This large scale process requires an easy ... [more ▼]

A process has been developed to enable the large scale production of pure TiO2 films deposited on 316L stainless steel in order to get an easy-to-clean surface. This large scale process requires an easy aqueous sol-gel procedure for the synthesis of the TiO2 sol. This synthesis has been simplified to facilitate the extrapolation towards an industrial scale. Results of TEM, photocatalytic properties, film hydrophilicity, and texture obtained with the simplified aqueous sol-gel synthesis (IsoP-TiO2 synthesis) show similar properties to those obtained with the standard aqueous sol-gel synthesis of TiO2 (HAc-TiO2 synthesis) developed previously. Only X-Ray Diffraction patterns showed differences, with the presence of anatase-brookite phases in IsoP-TiO2 synthesis while anatase phase only was observed in HAc-TiO2 synthesis. Both the aqueous sol-gel synthesis of pure TiO2 and the film deposition on steel by roll-coating have been successfully extrapolated to a larger scale. The photocatalytic activity and the hydrophilicity of the film were found to be unchanged when compared to films produced at a laboratory scale, thus validating the production of an efficient easy-to-clean material. Although some problems are still to be solved, this study is a hopeful first step in the development of a large scale process for self-cleaning steel production. [less ▲]

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See detailDevelopment of an easy aqueous sol-gel synthesis for large-scale film deposition methods for the manufacture of coated steel with self-cleaning properties
Mahy, Julien ULiege; Léonard, Géraldine ULiege; Pirard, Sophie ULiege et al

Conference (2016, May 20)

In this work, a global process has been developed to produce at a large scale pure TiO2 films deposited on steel in order to get an easy-to-clean surface. This large scale process implies an easy aqueous ... [more ▼]

In this work, a global process has been developed to produce at a large scale pure TiO2 films deposited on steel in order to get an easy-to-clean surface. This large scale process implies an easy aqueous sol-gel process for the synthesis of the TiO2 sol. This synthesis [1] has been simplified to make easier the extrapolation towards an industrial scale. Results of TEM, photocatalytic properties, film hydrophilicity, and texture obtained with the simplified aqueous sol-gel synthesis (IsoP-TiO2 synthesis) show similar properties than those obtained with the standard aqueous sol-gel synthesis of TiO2 developed previously (HAc-TiO2 synthesis [2]). Only XRD patterns were slightly different with the presence of anatase-brookite phases in IsoP-TiO2 synthesis while anatase phase only was observed in HAc-TiO2 synthesis. Both the aqueous sol-gel synthesis of pure TiO2 and the film deposition on steel by roll-coating have been successfully extrapolated to a larger scale. Indeed, the deposition was done on a pilot line, the steel substrate is 25 cm width, and the band length is 800 m. The coating was deposited at line speed ranging from 30 to 120 m.min-1.The photocatalytic activity and the hydrophilicity of the film were found to be unchanged compared to the films produced at a laboratory scale, thus validating the production of an efficient easy-to-clean material. Even if some problems have still to be solved, this study is a hopeful first step in the development of a large scale process for self-cleaning steel production. [1] S. Mahshid, M. Askari, M.S. Ghamsari, J. Mater. Process. Technol. 189 (2007) 296–300 [2] C.M. Malengreaux, S. Douven, D. Poelman, B. Heinrichs, J.R. Bartlett, J. Sol-Gel Sci. Technol. 71 (2014) 557–570 [less ▲]

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See detailMethod for the wet deposition of thin films
Pàez Martinez, Carlos ULiege; Liquet, Dimitri ULiege; Calberg, Cédric ULiege et al

Patent (2016)

Detailed reference viewed: 42 (21 ULiège)
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See detailWet method for the production of thin films (2)
Liquet, Dimitri ULiege; Calberg, Cédric ULiege; Eskenazi, David et al

Patent (2015)

Detailed reference viewed: 70 (21 ULiège)
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See detailWet method for the production of thin films (1)
Liquet, Dimitri ULiege; Calberg, Cédric ULiege; Eskenazi, David et al

Patent (2015)

Detailed reference viewed: 111 (52 ULiège)
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See detailProcess for manufacturing a composite material
Liquet, Dimitri ULiege; Pàez Martinez, Carlos ULiege; Calberg, Cédric ULiege et al

Patent (2013)

Detailed reference viewed: 193 (69 ULiège)
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See detailStudy of photocatalytic decomposition of hydrogen peroxide over ramsdellite-MnO2 by O2-pressure monitoring
Páez Martínez, Carlos ULiege; Liquet, Dimitri ULiege; Calberg, Cédric ULiege et al

in Catalysis Communications (2011), 15

The catalytic and photocatalytic activities of ramsdellite type manganese oxide, R-MnO2 were studied from the initial rate of decomposition of H2O2 in aqueous solution. The kinetic study was followed by ... [more ▼]

The catalytic and photocatalytic activities of ramsdellite type manganese oxide, R-MnO2 were studied from the initial rate of decomposition of H2O2 in aqueous solution. The kinetic study was followed by the production of O2 via gas pressure monitoring (O2-monitored method), in the dark and under visible light irradiation (λ≥400 nm), at 20 °C. Experimental data showed that the rate of H2O2 decomposition, under visible light irradiation and in the dark, obeys the first order kinetic law.While in the dark the H2O2 decomposition rate bymass unit was around 6.88 mmol g−1 s−1, under visible light irradiation theH2O2 decomposition rate achieved a maximal value of 15.13 mmol g−1 s−1. The increase in the H2O2 decomposition, by effect of the visible light, was observed in ranges of catalyst concentrations from 16 to 374 mg L−1. These results reflect the potential of R-MnO2 as a photoactive catalyst, being a consequence of presumed photoreduction of Mn4+centers. [less ▲]

Detailed reference viewed: 341 (12 ULiège)